summaryrefslogtreecommitdiffstats
path: root/libavcodec/tiff.c
blob: 7a7f9b748d1ea53995a1cc744314e587ae3de7e7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
/*
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * TIFF image decoder
 * @author Konstantin Shishkov
 */

#include "config.h"
#if CONFIG_ZLIB
#include <zlib.h>
#endif
#if CONFIG_LZMA
#define LZMA_API_STATIC
#include <lzma.h>
#endif

#include "libavutil/attributes.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "faxcompr.h"
#include "internal.h"
#include "lzw.h"
#include "mathops.h"
#include "tiff.h"
#include "tiff_data.h"
#include "thread.h"

typedef struct TiffContext {
    AVCodecContext *avctx;
    GetByteContext gb;

    int width, height;
    unsigned int bpp, bppcount;
    uint32_t palette[256];
    int palette_is_set;
    int le;
    enum TiffCompr compr;
    enum TiffPhotometric photometric;
    int planar;
    int subsampling[2];
    int fax_opts;
    int predictor;
    int fill_order;
    uint32_t res[4];

    int strips, rps, sstype;
    int sot;
    int stripsizesoff, stripsize, stripoff, strippos;
    LZWState *lzw;

    uint8_t *deinvert_buf;
    int deinvert_buf_size;
    uint8_t *yuv_line;
    unsigned int yuv_line_size;

    int geotag_count;
    TiffGeoTag *geotags;
} TiffContext;

static void free_geotags(TiffContext *const s)
{
    int i;
    for (i = 0; i < s->geotag_count; i++) {
        if (s->geotags[i].val)
            av_freep(&s->geotags[i].val);
    }
    av_freep(&s->geotags);
    s->geotag_count = 0;
}

#define RET_GEOKEY(TYPE, array, element)\
    if (key >= TIFF_##TYPE##_KEY_ID_OFFSET &&\
        key - TIFF_##TYPE##_KEY_ID_OFFSET < FF_ARRAY_ELEMS(ff_tiff_##array##_name_type_map))\
        return ff_tiff_##array##_name_type_map[key - TIFF_##TYPE##_KEY_ID_OFFSET].element;

static const char *get_geokey_name(int key)
{
    RET_GEOKEY(VERT, vert, name);
    RET_GEOKEY(PROJ, proj, name);
    RET_GEOKEY(GEOG, geog, name);
    RET_GEOKEY(CONF, conf, name);

    return NULL;
}

static int get_geokey_type(int key)
{
    RET_GEOKEY(VERT, vert, type);
    RET_GEOKEY(PROJ, proj, type);
    RET_GEOKEY(GEOG, geog, type);
    RET_GEOKEY(CONF, conf, type);

    return AVERROR_INVALIDDATA;
}

static int cmp_id_key(const void *id, const void *k)
{
    return *(const int*)id - ((const TiffGeoTagKeyName*)k)->key;
}

static const char *search_keyval(const TiffGeoTagKeyName *keys, int n, int id)
{
    TiffGeoTagKeyName *r = bsearch(&id, keys, n, sizeof(keys[0]), cmp_id_key);
    if(r)
        return r->name;

    return NULL;
}

static char *get_geokey_val(int key, int val)
{
    char *ap;

    if (val == TIFF_GEO_KEY_UNDEFINED)
        return av_strdup("undefined");
    if (val == TIFF_GEO_KEY_USER_DEFINED)
        return av_strdup("User-Defined");

#define RET_GEOKEY_VAL(TYPE, array)\
    if (val >= TIFF_##TYPE##_OFFSET &&\
        val - TIFF_##TYPE##_OFFSET < FF_ARRAY_ELEMS(ff_tiff_##array##_codes))\
        return av_strdup(ff_tiff_##array##_codes[val - TIFF_##TYPE##_OFFSET]);

    switch (key) {
    case TIFF_GT_MODEL_TYPE_GEOKEY:
        RET_GEOKEY_VAL(GT_MODEL_TYPE, gt_model_type);
        break;
    case TIFF_GT_RASTER_TYPE_GEOKEY:
        RET_GEOKEY_VAL(GT_RASTER_TYPE, gt_raster_type);
        break;
    case TIFF_GEOG_LINEAR_UNITS_GEOKEY:
    case TIFF_PROJ_LINEAR_UNITS_GEOKEY:
    case TIFF_VERTICAL_UNITS_GEOKEY:
        RET_GEOKEY_VAL(LINEAR_UNIT, linear_unit);
        break;
    case TIFF_GEOG_ANGULAR_UNITS_GEOKEY:
    case TIFF_GEOG_AZIMUTH_UNITS_GEOKEY:
        RET_GEOKEY_VAL(ANGULAR_UNIT, angular_unit);
        break;
    case TIFF_GEOGRAPHIC_TYPE_GEOKEY:
        RET_GEOKEY_VAL(GCS_TYPE, gcs_type);
        RET_GEOKEY_VAL(GCSE_TYPE, gcse_type);
        break;
    case TIFF_GEOG_GEODETIC_DATUM_GEOKEY:
        RET_GEOKEY_VAL(GEODETIC_DATUM, geodetic_datum);
        RET_GEOKEY_VAL(GEODETIC_DATUM_E, geodetic_datum_e);
        break;
    case TIFF_GEOG_ELLIPSOID_GEOKEY:
        RET_GEOKEY_VAL(ELLIPSOID, ellipsoid);
        break;
    case TIFF_GEOG_PRIME_MERIDIAN_GEOKEY:
        RET_GEOKEY_VAL(PRIME_MERIDIAN, prime_meridian);
        break;
    case TIFF_PROJECTED_CS_TYPE_GEOKEY:
        ap = av_strdup(search_keyval(ff_tiff_proj_cs_type_codes, FF_ARRAY_ELEMS(ff_tiff_proj_cs_type_codes), val));
        if(ap) return ap;
        break;
    case TIFF_PROJECTION_GEOKEY:
        ap = av_strdup(search_keyval(ff_tiff_projection_codes, FF_ARRAY_ELEMS(ff_tiff_projection_codes), val));
        if(ap) return ap;
        break;
    case TIFF_PROJ_COORD_TRANS_GEOKEY:
        RET_GEOKEY_VAL(COORD_TRANS, coord_trans);
        break;
    case TIFF_VERTICAL_CS_TYPE_GEOKEY:
        RET_GEOKEY_VAL(VERT_CS, vert_cs);
        RET_GEOKEY_VAL(ORTHO_VERT_CS, ortho_vert_cs);
        break;

    }

    ap = av_malloc(14);
    if (ap)
        snprintf(ap, 14, "Unknown-%d", val);
    return ap;
}

static char *doubles2str(double *dp, int count, const char *sep)
{
    int i;
    char *ap, *ap0;
    uint64_t component_len;
    if (!sep) sep = ", ";
    component_len = 24LL + strlen(sep);
    if (count >= (INT_MAX - 1)/component_len)
        return NULL;
    ap = av_malloc(component_len * count + 1);
    if (!ap)
        return NULL;
    ap0   = ap;
    ap[0] = '\0';
    for (i = 0; i < count; i++) {
        unsigned l = snprintf(ap, component_len, "%.15g%s", dp[i], sep);
        if(l >= component_len) {
            av_free(ap0);
            return NULL;
        }
        ap += l;
    }
    ap0[strlen(ap0) - strlen(sep)] = '\0';
    return ap0;
}

static int add_metadata(int count, int type,
                        const char *name, const char *sep, TiffContext *s, AVFrame *frame)
{
    switch(type) {
    case TIFF_DOUBLE: return ff_tadd_doubles_metadata(count, name, sep, &s->gb, s->le, avpriv_frame_get_metadatap(frame));
    case TIFF_SHORT : return ff_tadd_shorts_metadata(count, name, sep, &s->gb, s->le, 0, avpriv_frame_get_metadatap(frame));
    case TIFF_STRING: return ff_tadd_string_metadata(count, name, &s->gb, s->le, avpriv_frame_get_metadatap(frame));
    default         : return AVERROR_INVALIDDATA;
    };
}

static void av_always_inline horizontal_fill(unsigned int bpp, uint8_t* dst,
                                             int usePtr, const uint8_t *src,
                                             uint8_t c, int width, int offset)
{
    switch (bpp) {
    case 1:
        while (--width >= 0) {
            dst[(width+offset)*8+7] = (usePtr ? src[width] : c)      & 0x1;
            dst[(width+offset)*8+6] = (usePtr ? src[width] : c) >> 1 & 0x1;
            dst[(width+offset)*8+5] = (usePtr ? src[width] : c) >> 2 & 0x1;
            dst[(width+offset)*8+4] = (usePtr ? src[width] : c) >> 3 & 0x1;
            dst[(width+offset)*8+3] = (usePtr ? src[width] : c) >> 4 & 0x1;
            dst[(width+offset)*8+2] = (usePtr ? src[width] : c) >> 5 & 0x1;
            dst[(width+offset)*8+1] = (usePtr ? src[width] : c) >> 6 & 0x1;
            dst[(width+offset)*8+0] = (usePtr ? src[width] : c) >> 7;
        }
        break;
    case 2:
        while (--width >= 0) {
            dst[(width+offset)*4+3] = (usePtr ? src[width] : c) & 0x3;
            dst[(width+offset)*4+2] = (usePtr ? src[width] : c) >> 2 & 0x3;
            dst[(width+offset)*4+1] = (usePtr ? src[width] : c) >> 4 & 0x3;
            dst[(width+offset)*4+0] = (usePtr ? src[width] : c) >> 6;
        }
        break;
    case 4:
        while (--width >= 0) {
            dst[(width+offset)*2+1] = (usePtr ? src[width] : c) & 0xF;
            dst[(width+offset)*2+0] = (usePtr ? src[width] : c) >> 4;
        }
        break;
    default:
        if (usePtr) {
            memcpy(dst + offset, src, width);
        } else {
            memset(dst + offset, c, width);
        }
    }
}

static int deinvert_buffer(TiffContext *s, const uint8_t *src, int size)
{
    int i;

    av_fast_padded_malloc(&s->deinvert_buf, &s->deinvert_buf_size, size);
    if (!s->deinvert_buf)
        return AVERROR(ENOMEM);
    for (i = 0; i < size; i++)
        s->deinvert_buf[i] = ff_reverse[src[i]];

    return 0;
}

static void unpack_yuv(TiffContext *s, AVFrame *p,
                       const uint8_t *src, int lnum)
{
    int i, j, k;
    int w       = (s->width - 1) / s->subsampling[0] + 1;
    uint8_t *pu = &p->data[1][lnum / s->subsampling[1] * p->linesize[1]];
    uint8_t *pv = &p->data[2][lnum / s->subsampling[1] * p->linesize[2]];
    if (s->width % s->subsampling[0] || s->height % s->subsampling[1]) {
        for (i = 0; i < w; i++) {
            for (j = 0; j < s->subsampling[1]; j++)
                for (k = 0; k < s->subsampling[0]; k++)
                    p->data[0][FFMIN(lnum + j, s->height-1) * p->linesize[0] +
                               FFMIN(i * s->subsampling[0] + k, s->width-1)] = *src++;
            *pu++ = *src++;
            *pv++ = *src++;
        }
    }else{
        for (i = 0; i < w; i++) {
            for (j = 0; j < s->subsampling[1]; j++)
                for (k = 0; k < s->subsampling[0]; k++)
                    p->data[0][(lnum + j) * p->linesize[0] +
                               i * s->subsampling[0] + k] = *src++;
            *pu++ = *src++;
            *pv++ = *src++;
        }
    }
}

#if CONFIG_ZLIB
static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src,
                           int size)
{
    z_stream zstream = { 0 };
    int zret;

    zstream.next_in   = (uint8_t *)src;
    zstream.avail_in  = size;
    zstream.next_out  = dst;
    zstream.avail_out = *len;
    zret              = inflateInit(&zstream);
    if (zret != Z_OK) {
        av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
        return zret;
    }
    zret = inflate(&zstream, Z_SYNC_FLUSH);
    inflateEnd(&zstream);
    *len = zstream.total_out;
    return zret == Z_STREAM_END ? Z_OK : zret;
}

static int tiff_unpack_zlib(TiffContext *s, AVFrame *p, uint8_t *dst, int stride,
                            const uint8_t *src, int size, int width, int lines,
                            int strip_start, int is_yuv)
{
    uint8_t *zbuf;
    unsigned long outlen;
    int ret, line;
    outlen = width * lines;
    zbuf   = av_malloc(outlen);
    if (!zbuf)
        return AVERROR(ENOMEM);
    if (s->fill_order) {
        if ((ret = deinvert_buffer(s, src, size)) < 0) {
            av_free(zbuf);
            return ret;
        }
        src = s->deinvert_buf;
    }
    ret = tiff_uncompress(zbuf, &outlen, src, size);
    if (ret != Z_OK) {
        av_log(s->avctx, AV_LOG_ERROR,
               "Uncompressing failed (%lu of %lu) with error %d\n", outlen,
               (unsigned long)width * lines, ret);
        av_free(zbuf);
        return AVERROR_UNKNOWN;
    }
    src = zbuf;
    for (line = 0; line < lines; line++) {
        if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
            horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);
        } else {
            memcpy(dst, src, width);
        }
        if (is_yuv) {
            unpack_yuv(s, p, dst, strip_start + line);
            line += s->subsampling[1] - 1;
        }
        dst += stride;
        src += width;
    }
    av_free(zbuf);
    return 0;
}
#endif

#if CONFIG_LZMA
static int tiff_uncompress_lzma(uint8_t *dst, uint64_t *len, const uint8_t *src,
                                int size)
{
    lzma_stream stream = LZMA_STREAM_INIT;
    lzma_ret ret;

    stream.next_in   = (uint8_t *)src;
    stream.avail_in  = size;
    stream.next_out  = dst;
    stream.avail_out = *len;
    ret              = lzma_stream_decoder(&stream, UINT64_MAX, 0);
    if (ret != LZMA_OK) {
        av_log(NULL, AV_LOG_ERROR, "LZMA init error: %d\n", ret);
        return ret;
    }
    ret = lzma_code(&stream, LZMA_RUN);
    lzma_end(&stream);
    *len = stream.total_out;
    return ret == LZMA_STREAM_END ? LZMA_OK : ret;
}

static int tiff_unpack_lzma(TiffContext *s, AVFrame *p, uint8_t *dst, int stride,
                            const uint8_t *src, int size, int width, int lines,
                            int strip_start, int is_yuv)
{
    uint64_t outlen = width * lines;
    int ret, line;
    uint8_t *buf = av_malloc(outlen);
    if (!buf)
        return AVERROR(ENOMEM);
    if (s->fill_order) {
        if ((ret = deinvert_buffer(s, src, size)) < 0) {
            av_free(buf);
            return ret;
        }
        src = s->deinvert_buf;
    }
    ret = tiff_uncompress_lzma(buf, &outlen, src, size);
    if (ret != LZMA_OK) {
        av_log(s->avctx, AV_LOG_ERROR,
               "Uncompressing failed (%"PRIu64" of %"PRIu64") with error %d\n", outlen,
               (uint64_t)width * lines, ret);
        av_free(buf);
        return AVERROR_UNKNOWN;
    }
    src = buf;
    for (line = 0; line < lines; line++) {
        if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
            horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);
        } else {
            memcpy(dst, src, width);
        }
        if (is_yuv) {
            unpack_yuv(s, p, dst, strip_start + line);
            line += s->subsampling[1] - 1;
        }
        dst += stride;
        src += width;
    }
    av_free(buf);
    return 0;
}
#endif

static int tiff_unpack_fax(TiffContext *s, uint8_t *dst, int stride,
                           const uint8_t *src, int size, int width, int lines)
{
    int i, ret = 0;
    int line;
    uint8_t *src2 = av_malloc((unsigned)size +
                              FF_INPUT_BUFFER_PADDING_SIZE);

    if (!src2) {
        av_log(s->avctx, AV_LOG_ERROR,
               "Error allocating temporary buffer\n");
        return AVERROR(ENOMEM);
    }
    if (s->fax_opts & 2) {
        avpriv_request_sample(s->avctx, "Uncompressed fax mode");
        av_free(src2);
        return AVERROR_PATCHWELCOME;
    }
    if (!s->fill_order) {
        memcpy(src2, src, size);
    } else {
        for (i = 0; i < size; i++)
            src2[i] = ff_reverse[src[i]];
    }
    memset(src2 + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
    ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride,
                          s->compr, s->fax_opts);
    if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
        for (line = 0; line < lines; line++) {
            horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
            dst += stride;
        }
    av_free(src2);
    return ret;
}

static int tiff_unpack_strip(TiffContext *s, AVFrame *p, uint8_t *dst, int stride,
                             const uint8_t *src, int size, int strip_start, int lines)
{
    PutByteContext pb;
    int c, line, pixels, code, ret;
    const uint8_t *ssrc = src;
    int width = ((s->width * s->bpp) + 7) >> 3;
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(p->format);
    int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
                 (desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
                 desc->nb_components >= 3;

    if (s->planar)
        width /= s->bppcount;

    if (size <= 0)
        return AVERROR_INVALIDDATA;

    if (is_yuv) {
        int bytes_per_row = (((s->width - 1) / s->subsampling[0] + 1) * s->bpp *
                            s->subsampling[0] * s->subsampling[1] + 7) >> 3;
        av_fast_padded_malloc(&s->yuv_line, &s->yuv_line_size, bytes_per_row);
        if (s->yuv_line == NULL) {
            av_log(s->avctx, AV_LOG_ERROR, "Not enough memory\n");
            return AVERROR(ENOMEM);
        }
        dst = s->yuv_line;
        stride = 0;

        width = (s->width - 1) / s->subsampling[0] + 1;
        width = width * s->subsampling[0] * s->subsampling[1] + 2*width;
        av_assert0(width <= bytes_per_row);
        av_assert0(s->bpp == 24);
    }

    if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) {
#if CONFIG_ZLIB
        return tiff_unpack_zlib(s, p, dst, stride, src, size, width, lines,
                                strip_start, is_yuv);
#else
        av_log(s->avctx, AV_LOG_ERROR,
               "zlib support not enabled, "
               "deflate compression not supported\n");
        return AVERROR(ENOSYS);
#endif
    }
    if (s->compr == TIFF_LZMA) {
#if CONFIG_LZMA
        return tiff_unpack_lzma(s, p, dst, stride, src, size, width, lines,
                                strip_start, is_yuv);
#else
        av_log(s->avctx, AV_LOG_ERROR,
               "LZMA support not enabled\n");
        return AVERROR(ENOSYS);
#endif
    }
    if (s->compr == TIFF_LZW) {
        if (s->fill_order) {
            if ((ret = deinvert_buffer(s, src, size)) < 0)
                return ret;
            ssrc = src = s->deinvert_buf;
        }
        if (size > 1 && !src[0] && (src[1]&1)) {
            av_log(s->avctx, AV_LOG_ERROR, "Old style LZW is unsupported\n");
        }
        if ((ret = ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF)) < 0) {
            av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
            return ret;
        }
        for (line = 0; line < lines; line++) {
            pixels = ff_lzw_decode(s->lzw, dst, width);
            if (pixels < width) {
                av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n",
                       pixels, width);
                return AVERROR_INVALIDDATA;
            }
            if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
                horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
            if (is_yuv) {
                unpack_yuv(s, p, dst, strip_start + line);
                line += s->subsampling[1] - 1;
            }
            dst += stride;
        }
        return 0;
    }
    if (s->compr == TIFF_CCITT_RLE ||
        s->compr == TIFF_G3        ||
        s->compr == TIFF_G4) {
        if (is_yuv)
            return AVERROR_INVALIDDATA;

        return tiff_unpack_fax(s, dst, stride, src, size, width, lines);
    }

    bytestream2_init(&s->gb, src, size);
    bytestream2_init_writer(&pb, dst, is_yuv ? s->yuv_line_size : (stride * lines));

    for (line = 0; line < lines; line++) {
        if (src - ssrc > size) {
            av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
            return AVERROR_INVALIDDATA;
        }

        if (bytestream2_get_bytes_left(&s->gb) == 0 || bytestream2_get_eof(&pb))
            break;
        bytestream2_seek_p(&pb, stride * line, SEEK_SET);
        switch (s->compr) {
        case TIFF_RAW:
            if (ssrc + size - src < width)
                return AVERROR_INVALIDDATA;

            if (!s->fill_order) {
                horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),
                                dst, 1, src, 0, width, 0);
            } else {
                int i;
                for (i = 0; i < width; i++)
                    dst[i] = ff_reverse[src[i]];
            }
            src += width;
            break;
        case TIFF_PACKBITS:
            for (pixels = 0; pixels < width;) {
                if (ssrc + size - src < 2) {
                    av_log(s->avctx, AV_LOG_ERROR, "Read went out of bounds\n");
                    return AVERROR_INVALIDDATA;
                }
                code = s->fill_order ? (int8_t) ff_reverse[*src++]: (int8_t) *src++;
                if (code >= 0) {
                    code++;
                    if (pixels + code > width ||
                        ssrc + size - src < code) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "Copy went out of bounds\n");
                        return AVERROR_INVALIDDATA;
                    }
                    horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),
                                    dst, 1, src, 0, code, pixels);
                    src    += code;
                    pixels += code;
                } else if (code != -128) { // -127..-1
                    code = (-code) + 1;
                    if (pixels + code > width) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "Run went out of bounds\n");
                        return AVERROR_INVALIDDATA;
                    }
                    c = *src++;
                    horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),
                                    dst, 0, NULL, c, code, pixels);
                    pixels += code;
                }
            }
            if (s->fill_order) {
                int i;
                for (i = 0; i < width; i++)
                    dst[i] = ff_reverse[dst[i]];
            }
            break;
        }
        if (is_yuv) {
            unpack_yuv(s, p, dst, strip_start + line);
            line += s->subsampling[1] - 1;
        }
        dst += stride;
    }
    return 0;
}

static int init_image(TiffContext *s, ThreadFrame *frame)
{
    int ret;
    int create_gray_palette = 0;

    // make sure there is no aliasing in the following switch
    if (s->bpp >= 100 || s->bppcount >= 10) {
        av_log(s->avctx, AV_LOG_ERROR,
               "Unsupported image parameters: bpp=%d, bppcount=%d\n",
               s->bpp, s->bppcount);
        return AVERROR_INVALIDDATA;
    }

    switch (s->planar * 1000 + s->bpp * 10 + s->bppcount) {
    case 11:
        if (!s->palette_is_set) {
            s->avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
            break;
        }
    case 21:
    case 41:
        s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
        if (!s->palette_is_set) {
            create_gray_palette = 1;
        }
        break;
    case 81:
        s->avctx->pix_fmt = s->palette_is_set ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
        break;
    case 243:
        if (s->photometric == TIFF_PHOTOMETRIC_YCBCR) {
            if (s->subsampling[0] == 1 && s->subsampling[1] == 1) {
                s->avctx->pix_fmt = AV_PIX_FMT_YUV444P;
            } else if (s->subsampling[0] == 2 && s->subsampling[1] == 1) {
                s->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
            } else if (s->subsampling[0] == 4 && s->subsampling[1] == 1) {
                s->avctx->pix_fmt = AV_PIX_FMT_YUV411P;
            } else if (s->subsampling[0] == 1 && s->subsampling[1] == 2) {
                s->avctx->pix_fmt = AV_PIX_FMT_YUV440P;
            } else if (s->subsampling[0] == 2 && s->subsampling[1] == 2) {
                s->avctx->pix_fmt = AV_PIX_FMT_YUV420P;
            } else if (s->subsampling[0] == 4 && s->subsampling[1] == 4) {
                s->avctx->pix_fmt = AV_PIX_FMT_YUV410P;
            } else {
                av_log(s->avctx, AV_LOG_ERROR, "Unsupported YCbCr subsampling\n");
                return AVERROR_PATCHWELCOME;
            }
        } else
            s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
        break;
    case 161:
        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GRAY16LE : AV_PIX_FMT_GRAY16BE;
        break;
    case 162:
        s->avctx->pix_fmt = AV_PIX_FMT_YA8;
        break;
    case 322:
        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_YA16LE : AV_PIX_FMT_YA16BE;
        break;
    case 324:
        s->avctx->pix_fmt = AV_PIX_FMT_RGBA;
        break;
    case 483:
        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGB48LE  : AV_PIX_FMT_RGB48BE;
        break;
    case 644:
        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGBA64LE  : AV_PIX_FMT_RGBA64BE;
        break;
    case 1243:
        s->avctx->pix_fmt = AV_PIX_FMT_GBRP;
        break;
    case 1324:
        s->avctx->pix_fmt = AV_PIX_FMT_GBRAP;
        break;
    case 1483:
        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GBRP16LE : AV_PIX_FMT_GBRP16BE;
        break;
    case 1644:
        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GBRAP16LE : AV_PIX_FMT_GBRAP16BE;
        break;
    default:
        av_log(s->avctx, AV_LOG_ERROR,
               "This format is not supported (bpp=%d, bppcount=%d)\n",
               s->bpp, s->bppcount);
        return AVERROR_INVALIDDATA;
    }

    if (s->photometric == TIFF_PHOTOMETRIC_YCBCR) {
        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);
        if((desc->flags & AV_PIX_FMT_FLAG_RGB) ||
           !(desc->flags & AV_PIX_FMT_FLAG_PLANAR) ||
           desc->nb_components < 3) {
            av_log(s->avctx, AV_LOG_ERROR, "Unsupported YCbCr variant\n");
            return AVERROR_INVALIDDATA;
        }
    }

    if (s->width != s->avctx->width || s->height != s->avctx->height) {
        ret = ff_set_dimensions(s->avctx, s->width, s->height);
        if (ret < 0)
            return ret;
    }
    if ((ret = ff_thread_get_buffer(s->avctx, frame, 0)) < 0)
        return ret;
    if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
        if (!create_gray_palette)
            memcpy(frame->f->data[1], s->palette, sizeof(s->palette));
        else {
            /* make default grayscale pal */
            int i;
            uint32_t *pal = (uint32_t *)frame->f->data[1];
            for (i = 0; i < 1<<s->bpp; i++)
                pal[i] = 0xFFU << 24 | i * 255 / ((1<<s->bpp) - 1) * 0x010101;
        }
    }
    return 0;
}

static void set_sar(TiffContext *s, unsigned tag, unsigned num, unsigned den)
{
    int offset = tag == TIFF_YRES ? 2 : 0;
    s->res[offset++] = num;
    s->res[offset]   = den;
    if (s->res[0] && s->res[1] && s->res[2] && s->res[3])
        av_reduce(&s->avctx->sample_aspect_ratio.num, &s->avctx->sample_aspect_ratio.den,
                  s->res[2] * (uint64_t)s->res[1], s->res[0] * (uint64_t)s->res[3], INT32_MAX);
}

static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
{
    unsigned tag, type, count, off, value = 0, value2 = 0;
    int i, start;
    int pos;
    int ret;
    double *dp;

    ret = ff_tread_tag(&s->gb, s->le, &tag, &type, &count, &start);
    if (ret < 0) {
        goto end;
    }

    off = bytestream2_tell(&s->gb);
    if (count == 1) {
        switch (type) {
        case TIFF_BYTE:
        case TIFF_SHORT:
        case TIFF_LONG:
            value = ff_tget(&s->gb, type, s->le);
            break;
        case TIFF_RATIONAL:
            value  = ff_tget(&s->gb, TIFF_LONG, s->le);
            value2 = ff_tget(&s->gb, TIFF_LONG, s->le);
            break;
        case TIFF_STRING:
            if (count <= 4) {
                break;
            }
        default:
            value = UINT_MAX;
        }
    }

    switch (tag) {
    case TIFF_WIDTH:
        s->width = value;
        break;
    case TIFF_HEIGHT:
        s->height = value;
        break;
    case TIFF_BPP:
        if (count > 4U) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "This format is not supported (bpp=%d, %d components)\n",
                   value, count);
            return AVERROR_INVALIDDATA;
        }
        s->bppcount = count;
        if (count == 1)
            s->bpp = value;
        else {
            switch (type) {
            case TIFF_BYTE:
            case TIFF_SHORT:
            case TIFF_LONG:
                s->bpp = 0;
                if (bytestream2_get_bytes_left(&s->gb) < type_sizes[type] * count)
                    return AVERROR_INVALIDDATA;
                for (i = 0; i < count; i++)
                    s->bpp += ff_tget(&s->gb, type, s->le);
                break;
            default:
                s->bpp = -1;
            }
        }
        break;
    case TIFF_SAMPLES_PER_PIXEL:
        if (count != 1) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Samples per pixel requires a single value, many provided\n");
            return AVERROR_INVALIDDATA;
        }
        if (value > 4U) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Samples per pixel %d is too large\n", value);
            return AVERROR_INVALIDDATA;
        }
        if (s->bppcount == 1)
            s->bpp *= value;
        s->bppcount = value;
        break;
    case TIFF_COMPR:
        s->compr     = value;
        s->predictor = 0;
        switch (s->compr) {
        case TIFF_RAW:
        case TIFF_PACKBITS:
        case TIFF_LZW:
        case TIFF_CCITT_RLE:
            break;
        case TIFF_G3:
        case TIFF_G4:
            s->fax_opts = 0;
            break;
        case TIFF_DEFLATE:
        case TIFF_ADOBE_DEFLATE:
#if CONFIG_ZLIB
            break;
#else
            av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
            return AVERROR(ENOSYS);
#endif
        case TIFF_JPEG:
        case TIFF_NEWJPEG:
            avpriv_report_missing_feature(s->avctx, "JPEG compression");
            return AVERROR_PATCHWELCOME;
        case TIFF_LZMA:
#if CONFIG_LZMA
            break;
#else
            av_log(s->avctx, AV_LOG_ERROR, "LZMA not compiled in\n");
            return AVERROR(ENOSYS);
#endif
        default:
            av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n",
                   s->compr);
            return AVERROR_INVALIDDATA;
        }
        break;
    case TIFF_ROWSPERSTRIP:
        if (!value || (type == TIFF_LONG && value == UINT_MAX))
            value = s->height;
        s->rps = FFMIN(value, s->height);
        break;
    case TIFF_STRIP_OFFS:
        if (count == 1) {
            s->strippos = 0;
            s->stripoff = value;
        } else
            s->strippos = off;
        s->strips = count;
        if (s->strips == 1)
            s->rps = s->height;
        s->sot = type;
        break;
    case TIFF_STRIP_SIZE:
        if (count == 1) {
            s->stripsizesoff = 0;
            s->stripsize     = value;
            s->strips        = 1;
        } else {
            s->stripsizesoff = off;
        }
        s->strips = count;
        s->sstype = type;
        break;
    case TIFF_XRES:
    case TIFF_YRES:
        set_sar(s, tag, value, value2);
        break;
    case TIFF_TILE_BYTE_COUNTS:
    case TIFF_TILE_LENGTH:
    case TIFF_TILE_OFFSETS:
    case TIFF_TILE_WIDTH:
        av_log(s->avctx, AV_LOG_ERROR, "Tiled images are not supported\n");
        return AVERROR_PATCHWELCOME;
        break;
    case TIFF_PREDICTOR:
        s->predictor = value;
        break;
    case TIFF_PHOTOMETRIC:
        switch (value) {
        case TIFF_PHOTOMETRIC_WHITE_IS_ZERO:
        case TIFF_PHOTOMETRIC_BLACK_IS_ZERO:
        case TIFF_PHOTOMETRIC_RGB:
        case TIFF_PHOTOMETRIC_PALETTE:
        case TIFF_PHOTOMETRIC_YCBCR:
            s->photometric = value;
            break;
        case TIFF_PHOTOMETRIC_ALPHA_MASK:
        case TIFF_PHOTOMETRIC_SEPARATED:
        case TIFF_PHOTOMETRIC_CIE_LAB:
        case TIFF_PHOTOMETRIC_ICC_LAB:
        case TIFF_PHOTOMETRIC_ITU_LAB:
        case TIFF_PHOTOMETRIC_CFA:
        case TIFF_PHOTOMETRIC_LOG_L:
        case TIFF_PHOTOMETRIC_LOG_LUV:
        case TIFF_PHOTOMETRIC_LINEAR_RAW:
            avpriv_report_missing_feature(s->avctx,
                                          "PhotometricInterpretation 0x%04X",
                                          value);
            return AVERROR_PATCHWELCOME;
        default:
            av_log(s->avctx, AV_LOG_ERROR, "PhotometricInterpretation %u is "
                   "unknown\n", value);
            return AVERROR_INVALIDDATA;
        }
        break;
    case TIFF_FILL_ORDER:
        if (value < 1 || value > 2) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Unknown FillOrder value %d, trying default one\n", value);
            value = 1;
        }
        s->fill_order = value - 1;
        break;
    case TIFF_PAL: {
        GetByteContext pal_gb[3];
        off = type_sizes[type];
        if (count / 3 > 256 ||
            bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)
            return AVERROR_INVALIDDATA;

        pal_gb[0] = pal_gb[1] = pal_gb[2] = s->gb;
        bytestream2_skip(&pal_gb[1], count / 3 * off);
        bytestream2_skip(&pal_gb[2], count / 3 * off * 2);

        off = (type_sizes[type] - 1) << 3;
        for (i = 0; i < count / 3; i++) {
            uint32_t p = 0xFF000000;
            p |= (ff_tget(&pal_gb[0], type, s->le) >> off) << 16;
            p |= (ff_tget(&pal_gb[1], type, s->le) >> off) << 8;
            p |=  ff_tget(&pal_gb[2], type, s->le) >> off;
            s->palette[i] = p;
        }
        s->palette_is_set = 1;
        break;
    }
    case TIFF_PLANAR:
        s->planar = value == 2;
        break;
    case TIFF_YCBCR_SUBSAMPLING:
        if (count != 2) {
            av_log(s->avctx, AV_LOG_ERROR, "subsample count invalid\n");
            return AVERROR_INVALIDDATA;
        }
        for (i = 0; i < count; i++)
            s->subsampling[i] = ff_tget(&s->gb, type, s->le);
        break;
    case TIFF_T4OPTIONS:
        if (s->compr == TIFF_G3)
            s->fax_opts = value;
        break;
    case TIFF_T6OPTIONS:
        if (s->compr == TIFF_G4)
            s->fax_opts = value;
        break;
#define ADD_METADATA(count, name, sep)\
    if ((ret = add_metadata(count, type, name, sep, s, frame)) < 0) {\
        av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");\
        goto end;\
    }
    case TIFF_MODEL_PIXEL_SCALE:
        ADD_METADATA(count, "ModelPixelScaleTag", NULL);
        break;
    case TIFF_MODEL_TRANSFORMATION:
        ADD_METADATA(count, "ModelTransformationTag", NULL);
        break;
    case TIFF_MODEL_TIEPOINT:
        ADD_METADATA(count, "ModelTiepointTag", NULL);
        break;
    case TIFF_GEO_KEY_DIRECTORY:
        ADD_METADATA(1, "GeoTIFF_Version", NULL);
        ADD_METADATA(2, "GeoTIFF_Key_Revision", ".");
        s->geotag_count   = ff_tget_short(&s->gb, s->le);
        if (s->geotag_count > count / 4 - 1) {
            s->geotag_count = count / 4 - 1;
            av_log(s->avctx, AV_LOG_WARNING, "GeoTIFF key directory buffer shorter than specified\n");
        }
        if (bytestream2_get_bytes_left(&s->gb) < s->geotag_count * sizeof(int16_t) * 4) {
            s->geotag_count = 0;
            return -1;
        }
        s->geotags = av_mallocz_array(s->geotag_count, sizeof(TiffGeoTag));
        if (!s->geotags) {
            av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
            s->geotag_count = 0;
            goto end;
        }
        for (i = 0; i < s->geotag_count; i++) {
            s->geotags[i].key    = ff_tget_short(&s->gb, s->le);
            s->geotags[i].type   = ff_tget_short(&s->gb, s->le);
            s->geotags[i].count  = ff_tget_short(&s->gb, s->le);

            if (!s->geotags[i].type)
                s->geotags[i].val  = get_geokey_val(s->geotags[i].key, ff_tget_short(&s->gb, s->le));
            else
                s->geotags[i].offset = ff_tget_short(&s->gb, s->le);
        }
        break;
    case TIFF_GEO_DOUBLE_PARAMS:
        if (count >= INT_MAX / sizeof(int64_t))
            return AVERROR_INVALIDDATA;
        if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int64_t))
            return AVERROR_INVALIDDATA;
        dp = av_malloc_array(count, sizeof(double));
        if (!dp) {
            av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
            goto end;
        }
        for (i = 0; i < count; i++)
            dp[i] = ff_tget_double(&s->gb, s->le);
        for (i = 0; i < s->geotag_count; i++) {
            if (s->geotags[i].type == TIFF_GEO_DOUBLE_PARAMS) {
                if (s->geotags[i].count == 0
                    || s->geotags[i].offset + s->geotags[i].count > count) {
                    av_log(s->avctx, AV_LOG_WARNING, "Invalid GeoTIFF key %d\n", s->geotags[i].key);
                } else {
                    char *ap = doubles2str(&dp[s->geotags[i].offset], s->geotags[i].count, ", ");
                    if (!ap) {
                        av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
                        av_freep(&dp);
                        return AVERROR(ENOMEM);
                    }
                    s->geotags[i].val = ap;
                }
            }
        }
        av_freep(&dp);
        break;
    case TIFF_GEO_ASCII_PARAMS:
        pos = bytestream2_tell(&s->gb);
        for (i = 0; i < s->geotag_count; i++) {
            if (s->geotags[i].type == TIFF_GEO_ASCII_PARAMS) {
                if (s->geotags[i].count == 0
                    || s->geotags[i].offset +  s->geotags[i].count > count) {
                    av_log(s->avctx, AV_LOG_WARNING, "Invalid GeoTIFF key %d\n", s->geotags[i].key);
                } else {
                    char *ap;

                    bytestream2_seek(&s->gb, pos + s->geotags[i].offset, SEEK_SET);
                    if (bytestream2_get_bytes_left(&s->gb) < s->geotags[i].count)
                        return AVERROR_INVALIDDATA;
                    ap = av_malloc(s->geotags[i].count);
                    if (!ap) {
                        av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
                        return AVERROR(ENOMEM);
                    }
                    bytestream2_get_bufferu(&s->gb, ap, s->geotags[i].count);
                    ap[s->geotags[i].count - 1] = '\0'; //replace the "|" delimiter with a 0 byte
                    s->geotags[i].val = ap;
                }
            }
        }
        break;
    case TIFF_ARTIST:
        ADD_METADATA(count, "artist", NULL);
        break;
    case TIFF_COPYRIGHT:
        ADD_METADATA(count, "copyright", NULL);
        break;
    case TIFF_DATE:
        ADD_METADATA(count, "date", NULL);
        break;
    case TIFF_DOCUMENT_NAME:
        ADD_METADATA(count, "document_name", NULL);
        break;
    case TIFF_HOST_COMPUTER:
        ADD_METADATA(count, "computer", NULL);
        break;
    case TIFF_IMAGE_DESCRIPTION:
        ADD_METADATA(count, "description", NULL);
        break;
    case TIFF_MAKE:
        ADD_METADATA(count, "make", NULL);
        break;
    case TIFF_MODEL:
        ADD_METADATA(count, "model", NULL);
        break;
    case TIFF_PAGE_NAME:
        ADD_METADATA(count, "page_name", NULL);
        break;
    case TIFF_PAGE_NUMBER:
        ADD_METADATA(count, "page_number", " / ");
        break;
    case TIFF_SOFTWARE_NAME:
        ADD_METADATA(count, "software", NULL);
        break;
    default:
        if (s->avctx->err_recognition & AV_EF_EXPLODE) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Unknown or unsupported tag %d/0X%0X\n",
                   tag, tag);
            return AVERROR_INVALIDDATA;
        }
    }
end:
    if (s->bpp > 64U) {
        av_log(s->avctx, AV_LOG_ERROR,
                "This format is not supported (bpp=%d, %d components)\n",
                s->bpp, count);
        s->bpp = 0;
        return AVERROR_INVALIDDATA;
    }
    bytestream2_seek(&s->gb, start, SEEK_SET);
    return 0;
}

static int decode_frame(AVCodecContext *avctx,
                        void *data, int *got_frame, AVPacket *avpkt)
{
    TiffContext *const s = avctx->priv_data;
    AVFrame *const p = data;
    ThreadFrame frame = { .f = data };
    unsigned off;
    int le, ret, plane, planes;
    int i, j, entries, stride;
    unsigned soff, ssize;
    uint8_t *dst;
    GetByteContext stripsizes;
    GetByteContext stripdata;

    bytestream2_init(&s->gb, avpkt->data, avpkt->size);

    // parse image header
    if ((ret = ff_tdecode_header(&s->gb, &le, &off))) {
        av_log(avctx, AV_LOG_ERROR, "Invalid TIFF header\n");
        return ret;
    } else if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {
        av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
        return AVERROR_INVALIDDATA;
    }
    s->le          = le;
    // TIFF_BPP is not a required tag and defaults to 1
    s->bppcount    = s->bpp = 1;
    s->photometric = TIFF_PHOTOMETRIC_NONE;
    s->compr       = TIFF_RAW;
    s->fill_order  = 0;
    free_geotags(s);

    // Reset these offsets so we can tell if they were set this frame
    s->stripsizesoff = s->strippos = 0;
    /* parse image file directory */
    bytestream2_seek(&s->gb, off, SEEK_SET);
    entries = ff_tget_short(&s->gb, le);
    if (bytestream2_get_bytes_left(&s->gb) < entries * 12)
        return AVERROR_INVALIDDATA;
    for (i = 0; i < entries; i++) {
        if ((ret = tiff_decode_tag(s, p)) < 0)
            return ret;
    }

    for (i = 0; i<s->geotag_count; i++) {
        const char *keyname = get_geokey_name(s->geotags[i].key);
        if (!keyname) {
            av_log(avctx, AV_LOG_WARNING, "Unknown or unsupported GeoTIFF key %d\n", s->geotags[i].key);
            continue;
        }
        if (get_geokey_type(s->geotags[i].key) != s->geotags[i].type) {
            av_log(avctx, AV_LOG_WARNING, "Type of GeoTIFF key %d is wrong\n", s->geotags[i].key);
            continue;
        }
        ret = av_dict_set(avpriv_frame_get_metadatap(p), keyname, s->geotags[i].val, 0);
        if (ret<0) {
            av_log(avctx, AV_LOG_ERROR, "Writing metadata with key '%s' failed\n", keyname);
            return ret;
        }
    }

    if (!s->strippos && !s->stripoff) {
        av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
        return AVERROR_INVALIDDATA;
    }
    /* now we have the data and may start decoding */
    if ((ret = init_image(s, &frame)) < 0)
        return ret;

    if (s->strips == 1 && !s->stripsize) {
        av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
        s->stripsize = avpkt->size - s->stripoff;
    }

    if (s->stripsizesoff) {
        if (s->stripsizesoff >= (unsigned)avpkt->size)
            return AVERROR_INVALIDDATA;
        bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff,
                         avpkt->size - s->stripsizesoff);
    }
    if (s->strippos) {
        if (s->strippos >= (unsigned)avpkt->size)
            return AVERROR_INVALIDDATA;
        bytestream2_init(&stripdata, avpkt->data + s->strippos,
                         avpkt->size - s->strippos);
    }

    if (s->rps <= 0) {
        av_log(avctx, AV_LOG_ERROR, "rps %d invalid\n", s->rps);
        return AVERROR_INVALIDDATA;
    }

    planes = s->planar ? s->bppcount : 1;
    for (plane = 0; plane < planes; plane++) {
        stride = p->linesize[plane];
        dst = p->data[plane];
        for (i = 0; i < s->height; i += s->rps) {
            if (s->stripsizesoff)
                ssize = ff_tget(&stripsizes, s->sstype, le);
            else
                ssize = s->stripsize;

            if (s->strippos)
                soff = ff_tget(&stripdata, s->sot, le);
            else
                soff = s->stripoff;

            if (soff > avpkt->size || ssize > avpkt->size - soff) {
                av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");
                return AVERROR_INVALIDDATA;
            }
            if ((ret = tiff_unpack_strip(s, p, dst, stride, avpkt->data + soff, ssize, i,
                                         FFMIN(s->rps, s->height - i))) < 0) {
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return ret;
                break;
            }
            dst += s->rps * stride;
        }
        if (s->predictor == 2) {
            if (s->photometric == TIFF_PHOTOMETRIC_YCBCR) {
                av_log(s->avctx, AV_LOG_ERROR, "predictor == 2 with YUV is unsupported");
                return AVERROR_PATCHWELCOME;
            }
            dst   = p->data[plane];
            soff  = s->bpp >> 3;
            if (s->planar)
                soff  = FFMAX(soff / s->bppcount, 1);
            ssize = s->width * soff;
            if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48LE ||
                s->avctx->pix_fmt == AV_PIX_FMT_RGBA64LE ||
                s->avctx->pix_fmt == AV_PIX_FMT_GRAY16LE ||
                s->avctx->pix_fmt == AV_PIX_FMT_YA16LE ||
                s->avctx->pix_fmt == AV_PIX_FMT_GBRP16LE ||
                s->avctx->pix_fmt == AV_PIX_FMT_GBRAP16LE) {
                for (i = 0; i < s->height; i++) {
                    for (j = soff; j < ssize; j += 2)
                        AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));
                    dst += stride;
                }
            } else if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
                       s->avctx->pix_fmt == AV_PIX_FMT_RGBA64BE ||
                       s->avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
                       s->avctx->pix_fmt == AV_PIX_FMT_YA16BE ||
                       s->avctx->pix_fmt == AV_PIX_FMT_GBRP16BE ||
                       s->avctx->pix_fmt == AV_PIX_FMT_GBRAP16BE) {
                for (i = 0; i < s->height; i++) {
                    for (j = soff; j < ssize; j += 2)
                        AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));
                    dst += stride;
                }
            } else {
                for (i = 0; i < s->height; i++) {
                    for (j = soff; j < ssize; j++)
                        dst[j] += dst[j - soff];
                    dst += stride;
                }
            }
        }

        if (s->photometric == TIFF_PHOTOMETRIC_WHITE_IS_ZERO) {
            dst = p->data[plane];
            for (i = 0; i < s->height; i++) {
                for (j = 0; j < stride; j++)
                    dst[j] = (s->avctx->pix_fmt == AV_PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];
                dst += stride;
            }
        }
    }

    if (s->planar && s->bppcount > 2) {
        FFSWAP(uint8_t*, p->data[0],     p->data[2]);
        FFSWAP(int,      p->linesize[0], p->linesize[2]);
        FFSWAP(uint8_t*, p->data[0],     p->data[1]);
        FFSWAP(int,      p->linesize[0], p->linesize[1]);
    }

    *got_frame = 1;

    return avpkt->size;
}

static av_cold int tiff_init(AVCodecContext *avctx)
{
    TiffContext *s = avctx->priv_data;

    s->width  = 0;
    s->height = 0;
    s->subsampling[0] =
    s->subsampling[1] = 1;
    s->avctx  = avctx;
    ff_lzw_decode_open(&s->lzw);
    ff_ccitt_unpack_init();

    return 0;
}

static av_cold int tiff_end(AVCodecContext *avctx)
{
    TiffContext *const s = avctx->priv_data;

    free_geotags(s);

    ff_lzw_decode_close(&s->lzw);
    av_freep(&s->deinvert_buf);
    return 0;
}

AVCodec ff_tiff_decoder = {
    .name           = "tiff",
    .long_name      = NULL_IF_CONFIG_SMALL("TIFF image"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_TIFF,
    .priv_data_size = sizeof(TiffContext),
    .init           = tiff_init,
    .close          = tiff_end,
    .decode         = decode_frame,
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(tiff_init),
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
};
OpenPOWER on IntegriCloud